Setting up Caddy as a reverse proxy

Last updated: Jun 29, 2023

We like using Caddy because it makes setting up the reverse proxy and TLS a breeze.

Terminal

docker run -p 80:80 -p 443:443 caddy caddy reverse-proxy --to app.posthog.com:443 --from <YOUR_TRACKING_DOMAIN> --change-host-header

You'll want to sub out YOUR_TRACKING_DOMAIN for whatever domain you use for proxying to PostHog. We'd suggest something like e.yourdomain.com or the like.

Make sure your DNS records point to your machine and that ports 80 and 443 are open to the public and directed toward Caddy.

If you want to use a config file instead, you can use something of the form:

:{$PORT} {
  header {
    Access-Control-Allow-Origin https://<your domain name>
  }

  reverse_proxy https://app.posthog.com {
    header_up Host app.posthog.com
    header_down -Access-Control-Allow-Origin
  }
}

Questions?

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